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Glow-worm Boilers Boiler Efficiency Rating

Ever since warming their first home in 1934, Glow-worm have become a popular choice for homeowners and have gained a great reputation with engineers thanks to their reliability, lengthy warranties and high efficiency.

Whether you're looking for a Combi, System or Regular boiler, Glow-worm have an extensive range of each that are able to meet the heating demands of just about any home.

ModelTypeFuelEfficiency
Glow-worm 105-120 105-120Non-CondensingGas65.0%
Glow-worm 105-120B 105-120BNon-CondensingGas65.0%
Glow-worm 12hxiCondensingGas88.7%
Glow-worm 15hxiCondensingGas88.7%
Glow-worm 18hxiCondensingGas88.6%
Glow-worm 18sxiCondensingGas88.6%
Glow-worm 23cNon-CondensingGas79.9%
Glow-worm 240Non-CondensingGas65.0%
Glow-worm 246Non-CondensingGas65.0%
Glow-worm 24ciNon-CondensingGas78.3%
Glow-worm 24ci PlusNon-CondensingGas78.3%
Glow-worm 24cxiCondensingGas88.5%
Glow-worm 24hxiCondensingGas88.9%
Glow-worm 30 ciNon-CondensingGas79.6%
Glow-worm 30 siNon-CondensingGas79.7%
Glow-worm 30ci PlusNon-CondensingGas79.6%
Glow-worm 30cxiCondensingGas88.5%
Glow-worm 30hxiCondensingGas88.7%
Glow-worm 30sxiCondensingGas88.7%
Glow-worm 35ciNon-CondensingGas78.6%
Glow-worm 38cxiCondensingGas88.5%
Glow-worm 38hxiCondensingGas89.2%
Glow-worm 45Non-CondensingGas65.0%
Glow-worm 45-60 45-60Non-CondensingGas65.0%
Glow-worm 45-60B 45-60BNon-CondensingGas65.0%
Glow-worm 45/2 BBUNon-CondensingGas68.4%
Glow-worm 45/4 BBUNon-CondensingGas78.4%
Glow-worm 45FNon-CondensingGas65.0%
Glow-worm 45FRNon-CondensingGas65.0%
Glow-worm 54/4 BBUNon-CondensingGas78.9%
Glow-worm 56Non-CondensingGas65.0%
Glow-worm 56/2 BBUNon-CondensingGas68.1%
Glow-worm 56/3e BBUNon-CondensingGas78.5%
Glow-worm 56/3pp BBUNon-CondensingGas74.5%
Glow-worm 56FNon-CondensingGas65.0%
Glow-worm 56FRNon-CondensingGas65.0%
Glow-worm 65-80 65-80Non-CondensingGas65.0%
Glow-worm 65-80B 65-80BNon-CondensingGas65.0%
Glow-worm 85-100 85-100Non-CondensingGas65.0%
Glow-worm 85-100B 85-100BNon-CondensingGas65.0%
Glow-worm BBU 45/4 Black Beauty 4Non-CondensingGas78.4%
Glow-worm BBU 45/4 Chatsworth 4Non-CondensingGas79.5%
Glow-worm BBU 45/4 Contour 4Non-CondensingGas78.4%
Glow-worm BBU 45/4 Dovedale 4Non-CondensingGas79.5%
Glow-worm BBU 45/4 Firelite 4Non-CondensingGas78.4%
Glow-worm BBU 45/4 Heartbeat 4Non-CondensingGas78.4%
Glow-worm BBU 45/4 Miami 4Non-CondensingGas78.4%
Glow-worm BBU 54/4 Black Beauty 4Non-CondensingGas78.8%
Glow-worm BBU 54/4 Chatsworth 4Non-CondensingGas79.4%
Glow-worm BBU 54/4 Contour 4Non-CondensingGas78.8%
Glow-worm BBU 54/4 Dovedale 4Non-CondensingGas79.4%
Glow-worm BBU 54/4 Firelite 4Non-CondensingGas78.8%
Glow-worm BBU 54/4 Heartbeat 4Non-CondensingGas78.8%
Glow-worm BBU 54/4 Miami 4Non-CondensingGas78.8%
Glow-worm Betacom 24CondensingGas85.9%
Glow-worm Betacom 24aCondensingGas89.0%
Glow-worm Betacom 24cCondensingGas85.6%
Glow-worm Betacom 28aCondensingGas89.2%
Glow-worm Betacom 30CondensingGas86.2%
Glow-worm Betacom 30cCondensingGas85.7%
Glow-worm BETACOM 4 30c-A (H-GB)CondensingGas89.6%
Glow-worm Betacom2 24CondensingGas89.0%
Glow-worm Betacom2 28CondensingGas88.5%
Glow-worm Betacom3 24cCondensingGas89.2%
Glow-worm Betacom3 30cCondensingGas89.2%
Glow-worm Camelot 240/6Non-CondensingGas65.0%
Glow-worm Capricorn 240/6Non-CondensingGas65.0%
Glow-worm Capricorn 246Non-CondensingGas65.0%
Glow-worm Compact 100 System ANon-CondensingGas79.3%
Glow-worm Compact 100eNon-CondensingGas78.2%
Glow-worm Compact 100e ANon-CondensingGas79.2%
Glow-worm Compact 100pNon-CondensingGas71.6%
Glow-worm Compact 60 System ANon-CondensingGas79.5%
Glow-worm Compact 75eNon-CondensingGas77.5%
Glow-worm Compact 75pNon-CondensingGas72.1%
Glow-worm Compact 80eNon-CondensingGas77.8%
Glow-worm Compact 80e ANon-CondensingGas79.5%
Glow-worm Compact 80pNon-CondensingGas72.2%
Glow-worm Easicom 2 24cCondensingGas89.2%
Glow-worm Easicom 2 28cCondensingGas89.2%
Glow-worm Easicom 24CondensingGas89.0%
Glow-worm Easicom 28CondensingGas88.5%
Glow-worm EASICOM 3 25rCondensingGas89.7%
Glow-worm EASICOM 3 25sCondensingGas89.7%
Glow-worm EASICOM 3 28c-A (H-GB)CondensingGas89.6%
Glow-worm Economy Plus 100fNon-CondensingGas72.0%
Glow-worm Economy Plus 24BNon-CondensingGas75.1%
Glow-worm Economy Plus 24FNon-CondensingGas77.2%
Glow-worm Economy Plus 30BNon-CondensingGas71.3%
Glow-worm Economy Plus 30CNon-CondensingGas72.4%
Glow-worm Economy Plus 30FNon-CondensingGas75.7%
Glow-worm Economy Plus 40BNon-CondensingGas71.9%
Glow-worm Economy Plus 40CNon-CondensingGas71.9%
Glow-worm Economy Plus 40FNon-CondensingGas77.0%
Glow-worm Economy Plus 50BNon-CondensingGas73.1%
Glow-worm Economy Plus 50CNon-CondensingGas72.4%
Glow-worm Economy Plus 50FNon-CondensingGas76.3%
Glow-worm Economy Plus 60BNon-CondensingGas75.4%
Glow-worm Economy Plus 60CNon-CondensingGas73.8%
Glow-worm Economy Plus 60FNon-CondensingGas75.8%
Glow-worm Economy Plus 75BNon-CondensingGas65.0%
Glow-worm Economy Plus 80FNon-CondensingGas77.6%
Glow-worm ENERGY 12rCondensingGas89.3%
Glow-worm ENERGY 12sCondensingGas89.3%
Glow-worm ENERGY 15rCondensingGas89.3%
Glow-worm ENERGY 15sCondensingGas89.3%
Glow-worm ENERGY 18rCondensingGas89.3%
Glow-worm ENERGY 18sCondensingGas89.3%
Glow-worm Energy 25cCondensingGas89.2%
Glow-worm ENERGY 25rCondensingGas89.3%
Glow-worm ENERGY 25sCondensingGas89.3%
Glow-worm Energy 30cCondensingGas89.2%
Glow-worm ENERGY 30rCondensingGas89.2%
Glow-worm ENERGY 30sCondensingGas89.2%
Glow-worm Energy 35 StoreCondensingGas89.4%
Glow-worm Energy 35cCondensingGas89.2%
Glow-worm Energysaver 30CondensingGas85.9%
Glow-worm Energysaver 30eCondensingGas85.9%
Glow-worm Energysaver 40CondensingGas86.0%
Glow-worm Energysaver 40eCondensingGas86.0%
Glow-worm Energysaver 40PCondensingLPG86.4%
Glow-worm Energysaver 50CondensingGas86.1%
Glow-worm Energysaver 50eCondensingGas86.1%
Glow-worm Energysaver 50PCondensingLPG86.5%
Glow-worm Energysaver 60CondensingGas86.2%
Glow-worm Energysaver 60eCondensingGas86.2%
Glow-worm Energysaver 60PCondensingLPG86.5%
Glow-worm Energysaver 70CondensingGas86.6%
Glow-worm Energysaver 80CondensingGas86.6%
Glow-worm Energysaver 80PCondensingLPG87.6%
Glow-worm Energysaver Combi 100CondensingGas89.2%
Glow-worm Energysaver Combi 80CondensingGas89.4%
Glow-worm Essential 24cCondensingGas89.2%
Glow-worm Essential 28cCondensingGas89.2%
Glow-worm Flexicom 12hxCondensingGas88.5%
Glow-worm Flexicom 15hxCondensingGas88.5%
Glow-worm Flexicom 18hxCondensingGas88.4%
Glow-worm Flexicom 18sxCondensingGas88.4%
Glow-worm Flexicom 24cxCondensingGas88.4%
Glow-worm Flexicom 24hxCondensingGas88.4%
Glow-worm Flexicom 30cxCondensingGas88.3%
Glow-worm Flexicom 30hxCondensingGas88.7%
Glow-worm Flexicom 30sxCondensingGas88.8%
Glow-worm Flexicom 35cxCondensingGas89.1%
Glow-worm Flexicom 35hxCondensingGas89.2%
Glow-worm Fuelsaver 100FNon-CondensingGas72.0%
Glow-worm Fuelsaver 25-30Non-CondensingGas65.0%
Glow-worm Fuelsaver 25-30BNon-CondensingGas65.0%
Glow-worm Fuelsaver 30-40Non-CondensingGas65.0%
Glow-worm Fuelsaver 30-40BNon-CondensingGas65.0%
Glow-worm Fuelsaver 30bmk2Non-CondensingGas65.0%
Glow-worm Fuelsaver 30brmk2Non-CondensingGas65.0%
Glow-worm Fuelsaver 30mk2Non-CondensingGas65.0%
Glow-worm Fuelsaver 35fNon-CondensingGas68.0%
Glow-worm Fuelsaver 40-50Non-CondensingGas65.0%
Glow-worm Fuelsaver 40-50bNon-CondensingGas65.0%
Glow-worm Fuelsaver 40bmk2Non-CondensingGas65.0%
Glow-worm Fuelsaver 40brmk2Non-CondensingGas65.0%
Glow-worm Fuelsaver 40mk2Non-CondensingGas65.0%
Glow-worm Fuelsaver 45fNon-CondensingGas68.0%
Glow-worm Fuelsaver 50bmk2Non-CondensingGas65.0%
Glow-worm Fuelsaver 50brmk2Non-CondensingGas65.0%
Glow-worm Fuelsaver 50mk2Non-CondensingGas65.0%
Glow-worm Fuelsaver 55-60bNon-CondensingGas65.0%
Glow-worm Fuelsaver 55fNon-CondensingGas68.0%
Glow-worm Fuelsaver 60-70bNon-CondensingGas65.0%
Glow-worm Fuelsaver 60bmk2Non-CondensingGas65.0%
Glow-worm Fuelsaver 60brmk2Non-CondensingGas65.0%
Glow-worm Fuelsaver 60mk2Non-CondensingGas65.0%
Glow-worm Fuelsaver 65fNon-CondensingGas68.0%
Glow-worm Fuelsaver 75bmk2Non-CondensingGas65.0%
Glow-worm Fuelsaver 75brmk2Non-CondensingGas65.0%
Glow-worm Fuelsaver 75mk2Non-CondensingGas65.0%
Glow-worm Fuelsaver 80fNon-CondensingGas68.0%
Glow-worm Fuelsaver Complheat 30Non-CondensingGas76.5%
Glow-worm Fuelsaver Complheat 40Non-CondensingGas76.7%
Glow-worm Fuelsaver Complheat 55Non-CondensingGas76.4%
Glow-worm Fuelsaver Complheat 65Non-CondensingGas79.1%
Glow-worm Fuelsaver Complheat 80Non-CondensingGas79.0%
Glow-worm Fuelsaver Economy Plus 24BNon-CondensingGas65.0%
Glow-worm Fuelsaver Economy Plus 24FNon-CondensingGas68.0%
Glow-worm Fuelsaver Economy Plus 30BNon-CondensingGas65.0%
Glow-worm Fuelsaver Economy Plus 30FNon-CondensingGas68.0%
Glow-worm Fuelsaver Economy Plus 40BNon-CondensingGas65.0%
Glow-worm Fuelsaver Economy Plus 40CNon-CondensingGas65.0%
Glow-worm Fuelsaver Economy Plus 40FNon-CondensingGas68.0%
Glow-worm Fuelsaver Economy Plus 50CNon-CondensingGas65.0%
Glow-worm Fuelsaver Economy Plus 50FNon-CondensingGas68.0%
Glow-worm Fuelsaver Economy Plus 60BNon-CondensingGas65.0%
Glow-worm Fuelsaver Economy Plus 60CNon-CondensingGas65.0%
Glow-worm Fuelsaver Economy Plus 60FNon-CondensingGas68.0%
Glow-worm Fuelsaver Economy Plus 80FNon-CondensingGas68.0%
Glow-worm Galaxie 240/6Non-CondensingGas65.0%
Glow-worm Galaxie 246Non-CondensingGas65.0%
Glow-worm Glow-Worm 18siNon-CondensingGas76.8%
Glow-worm Hideaway 100Non-CondensingGas72.1%
Glow-worm Hideaway 100BNon-CondensingGas73.0%
Glow-worm Hideaway 100BFFNon-CondensingGas79.9%
Glow-worm Hideaway 100CFFNon-CondensingGas79.9%
Glow-worm Hideaway 115BFFNon-CondensingGas78.7%
Glow-worm Hideaway 115CFFNon-CondensingGas78.7%
Glow-worm Hideaway 120Non-CondensingGas73.0%
Glow-worm Hideaway 120BNon-CondensingGas72.0%
Glow-worm Hideaway 40Non-CondensingGas70.8%
Glow-worm Hideaway 40BNon-CondensingGas71.5%
Glow-worm Hideaway 40BFFNon-CondensingGas78.3%
Glow-worm Hideaway 40CFFNon-CondensingGas78.3%
Glow-worm Hideaway 50Non-CondensingGas71.0%
Glow-worm Hideaway 50BNon-CondensingGas71.4%
Glow-worm Hideaway 50BFFNon-CondensingGas78.2%
Glow-worm Hideaway 50CFFNon-CondensingGas78.2%
Glow-worm Hideaway 60Non-CondensingGas71.3%
Glow-worm Hideaway 60BNon-CondensingGas71.7%
Glow-worm Hideaway 60BFFNon-CondensingGas78.5%
Glow-worm Hideaway 60BLNon-CondensingGas65.0%
Glow-worm Hideaway 60CFFNon-CondensingGas78.5%
Glow-worm Hideaway 60LNon-CondensingGas65.0%
Glow-worm Hideaway 70Non-CondensingGas71.8%
Glow-worm Hideaway 70BNon-CondensingGas72.5%
Glow-worm Hideaway 70ofNon-CondensingGas65.0%
Glow-worm Hideaway 80Non-CondensingGas71.7%
Glow-worm Hideaway 80BNon-CondensingGas72.6%
Glow-worm Hideaway 80BFFNon-CondensingGas78.4%
Glow-worm Hideaway 80BLNon-CondensingGas65.0%
Glow-worm Hideaway 80CFFNon-CondensingGas78.4%
Glow-worm Hideaway 80LNon-CondensingGas65.0%
Glow-worm Hideaway 90Non-CondensingGas71.7%
Glow-worm Hideaway 90BNon-CondensingGas72.8%
Glow-worm Hideaway 90ofNon-CondensingGas65.0%
Glow-worm HOME 12rCondensingGas89.3%
Glow-worm HOME 12sCondensingGas89.3%
Glow-worm HOME 15rCondensingGas89.3%
Glow-worm HOME 15sCondensingGas89.3%
Glow-worm HOME 18rCondensingGas89.3%
Glow-worm HOME 18sCondensingGas89.3%
Glow-worm HOME 25cCondensingGas89.3%
Glow-worm HOME 25rCondensingGas89.3%
Glow-worm HOME 25sCondensingGas89.3%
Glow-worm HOME 30cCondensingGas89.3%
Glow-worm HOME 30rCondensingGas89.2%
Glow-worm HOME 35cCondensingGas89.3%
Glow-worm Inset BBU 40Non-CondensingGas75.5%
Glow-worm Inset BBU 50Non-CondensingGas77.6%
Glow-worm Majorca 240/6Non-CondensingGas65.0%
Glow-worm Majorca 246Non-CondensingGas65.0%
Glow-worm Majorca 340/6Non-CondensingGas65.0%
Glow-worm Majorca 340/6autoNon-CondensingGas65.0%
Glow-worm Majorca 346Non-CondensingGas65.0%
Glow-worm Micron 100FFNon-CondensingGas79.5%
Glow-worm Micron 120FFNon-CondensingGas78.1%
Glow-worm Micron 30 FFNon-CondensingGas78.3%
Glow-worm Micron 30FFNon-CondensingGas76.6%
Glow-worm Micron 40 FFNon-CondensingGas78.7%
Glow-worm Micron 40FFNon-CondensingGas77.3%
Glow-worm Micron 50FFNon-CondensingGas78.9%
Glow-worm Micron 60 FFNon-CondensingGas78.8%
Glow-worm Micron 60FFNon-CondensingGas77.2%
Glow-worm Micron 70 FFNon-CondensingGas78.3%
Glow-worm Micron 70FFNon-CondensingGas77.4%
Glow-worm Micron 80 FFNon-CondensingGas78.3%
Glow-worm Micron 80FFNon-CondensingGas77.2%
Glow-worm Micron100FFNon-CondensingGas77.5%
Glow-worm PROCOMBI ESSENTIAL 24c P – A (H-GB)CondensingLPG91.1%
Glow-worm PROCOMBI ESSENTIAL 35cCondensingGas89.7%
Glow-worm Royale 240/6Non-CondensingGas65.0%
Glow-worm Royale 246Non-CondensingGas65.0%
Glow-worm Saunier Duval SB30e ANon-CondensingGas79.3%
Glow-worm Saunier Duval SD30e ANon-CondensingGas79.2%
Glow-worm Spacesaver 20-30fNon-CondensingGas68.0%
Glow-worm Spacesaver 20-30rfNon-CondensingGas68.0%
Glow-worm Spacesaver 20-30rfsNon-CondensingGas68.0%
Glow-worm Spacesaver 22-30bNon-CondensingGas65.0%
Glow-worm Spacesaver 22-30fNon-CondensingGas65.0%
Glow-worm Spacesaver 30-40fNon-CondensingGas68.0%
Glow-worm Spacesaver 30-40rfNon-CondensingGas68.0%
Glow-worm Spacesaver 30-40rfsNon-CondensingGas68.0%
Glow-worm Spacesaver 30bmk2Non-CondensingGas65.0%
Glow-worm Spacesaver 30brmk2Non-CondensingGas65.0%
Glow-worm Spacesaver 30mk2Non-CondensingGas65.0%
Glow-worm Spacesaver 30rmk2Non-CondensingGas65.0%
Glow-worm Spacesaver 38Non-CondensingGas65.0%
Glow-worm Spacesaver 38bfNon-CondensingGas65.0%
Glow-worm Spacesaver 40-50rfNon-CondensingGas68.0%
Glow-worm Spacesaver 40-50rfsNon-CondensingGas68.0%
Glow-worm Spacesaver 40bmk2Non-CondensingGas65.0%
Glow-worm Spacesaver 40brmk2Non-CondensingGas65.0%
Glow-worm Spacesaver 40fNon-CondensingGas68.0%
Glow-worm Spacesaver 40mk2Non-CondensingGas65.0%
Glow-worm Spacesaver 40rmk2Non-CondensingGas65.0%
Glow-worm Spacesaver 45-60Non-CondensingGas65.0%
Glow-worm Spacesaver 45-60bNon-CondensingGas65.0%
Glow-worm Spacesaver 50-60rfNon-CondensingGas68.0%
Glow-worm Spacesaver 50-60rfsNon-CondensingGas68.0%
Glow-worm Spacesaver 50bfNon-CondensingGas65.0%
Glow-worm Spacesaver 50bmk2Non-CondensingGas65.0%
Glow-worm Spacesaver 50fNon-CondensingGas68.0%
Glow-worm Spacesaver 50mk2Non-CondensingGas65.0%
Glow-worm Spacesaver 50rmk2Non-CondensingGas65.0%
Glow-worm Spacesaver 52Non-CondensingGas65.0%
Glow-worm Spacesaver 60bmk2Non-CondensingGas65.0%
Glow-worm Spacesaver 60brmk2Non-CondensingGas65.0%
Glow-worm Spacesaver 60fNon-CondensingGas68.0%
Glow-worm Spacesaver 60mk2Non-CondensingGas65.0%
Glow-worm Spacesaver 60rmk2Non-CondensingGas65.0%
Glow-worm Spacesaver 65-75fNon-CondensingGas68.0%
Glow-worm Spacesaver 75Non-CondensingGas65.0%
Glow-worm Spacesaver 75bfNon-CondensingGas65.0%
Glow-worm Spacesaver 80bmk2Non-CondensingGas65.0%
Glow-worm Spacesaver 80brmk2Non-CondensingGas65.0%
Glow-worm Spacesaver Complheat 60Non-CondensingGas72.0%
Glow-worm Spacesaver Complheat 70Non-CondensingGas72.0%
Glow-worm Spacesaver Kfb 20Non-CondensingGas68.0%
Glow-worm Spacesaver Kfb 60Non-CondensingGas68.0%
Glow-worm Spacesaver Kfb 70Non-CondensingGas68.0%
Glow-worm Suburban SuburbanNon-CondensingGas65.0%
Glow-worm Super 30Non-CondensingGas65.0%
Glow-worm Super 30bNon-CondensingGas65.0%
Glow-worm Super 40Non-CondensingGas65.0%
Glow-worm Super 40bNon-CondensingGas65.0%
Glow-worm Super 52Non-CondensingGas65.0%
Glow-worm Super 52bNon-CondensingGas65.0%
Glow-worm SUSTAIN 12rCondensingGas89.3%
Glow-worm SUSTAIN 12sCondensingGas89.3%
Glow-worm SUSTAIN 15rCondensingGas89.3%
Glow-worm SUSTAIN 15sCondensingGas89.3%
Glow-worm SUSTAIN 18rCondensingGas89.3%
Glow-worm SUSTAIN 18sCondensingGas89.3%
Glow-worm SUSTAIN 25cCondensingGas89.3%
Glow-worm SUSTAIN 30cCondensingGas89.3%
Glow-worm SUSTAIN 35cCondensingGas89.3%
Glow-worm Swiftflow 100Non-CondensingGas70.0%
Glow-worm Swiftflow 100 Honeywell valveNon-CondensingGas70.7%
Glow-worm Swiftflow 100 SIT valveNon-CondensingGas70.7%
Glow-worm Swiftflow 100eNon-CondensingGas76.6%
Glow-worm Swiftflow 120Non-CondensingGas73.1%
Glow-worm Swiftflow 125eNon-CondensingGas79.4%
Glow-worm Swiftflow 75Non-CondensingGas70.0%
Glow-worm Swiftflow 75 Honeywell valveNon-CondensingGas71.4%
Glow-worm Swiftflow 75 SIT valveNon-CondensingGas71.4%
Glow-worm Swiftflow 75eNon-CondensingGas76.5%
Glow-worm Swiftflow 80Non-CondensingGas70.0%
Glow-worm Swiftflow 80 Honeywell valveNon-CondensingGas73.1%
Glow-worm Swiftflow 80 SIT valveNon-CondensingGas73.1%
Glow-worm Swiftflow 80eNon-CondensingGas76.6%
Glow-worm Ultimate 100 FFNon-CondensingGas79.5%
Glow-worm Ultimate 100FFNon-CondensingGas77.5%
Glow-worm Ultimate 120FFNon-CondensingGas78.1%
Glow-worm Ultimate 2 25rCondensingGas89.3%
Glow-worm ULTIMATE 2 25sCondensingGas89.3%
Glow-worm ULTIMATE 2 30CCondensingGas89.2%
Glow-worm ULTIMATE 2 35cCondensingGas89.2%
Glow-worm Ultimate 24hCondensingGas88.4%
Glow-worm ULTIMATE 3 25r-A (H-GB)CondensingGas89.6%
Glow-worm ULTIMATE 3 25s-A (H-GB)CondensingGas89.7%
Glow-worm ULTIMATE 3 30c-A (H-GB)CondensingGas89.6%
Glow-worm ULTIMATE 3 35c-A (H-GB)CondensingGas89.7%
Glow-worm Ultimate 30BFNon-CondensingGas73.0%
Glow-worm Ultimate 30cCondensingGas88.9%
Glow-worm Ultimate 30FFNon-CondensingGas79.7%
Glow-worm Ultimate 30FF/LPNon-CondensingLPG78.0%
Glow-worm Ultimate 35cCondensingGas88.8%
Glow-worm Ultimate 40 FFNon-CondensingGas78.7%
Glow-worm Ultimate 40BFNon-CondensingGas72.1%
Glow-worm Ultimate 40FFNon-CondensingGas75.4%
Glow-worm Ultimate 40FF/LPNon-CondensingLPG78.0%
Glow-worm Ultimate 50 FFNon-CondensingGas78.8%
Glow-worm Ultimate 50BFNon-CondensingGas73.1%
Glow-worm Ultimate 50BF/LPNon-CondensingLPG74.8%
Glow-worm Ultimate 50FFNon-CondensingGas76.0%
Glow-worm Ultimate 50FF/LPNon-CondensingLPG80.1%
Glow-worm Ultimate 60 FFNon-CondensingGas79.4%
Glow-worm Ultimate 60BFNon-CondensingGas75.6%
Glow-worm Ultimate 60FFNon-CondensingGas76.6%
Glow-worm Ultimate 60FF/LPNon-CondensingLPG77.5%
Glow-worm Ultimate 70 FFNon-CondensingGas79.3%
Glow-worm Ultimate 70FFNon-CondensingGas77.1%
Glow-worm Ultimate 80 FFNon-CondensingGas79.4%
Glow-worm Ultimate 80bfNon-CondensingGas65.0%
Glow-worm Ultimate 80FFNon-CondensingGas76.3%
Glow-worm Ultimate 80FF/LPNon-CondensingLPG79.8%
Glow-worm Ultracom 12hxiCondensingGas88.7%
Glow-worm Ultracom 15hxiCondensingGas88.7%
Glow-worm Ultracom 18hxiCondensingGas88.6%
Glow-worm Ultracom 18sxiCondensingGas88.6%
Glow-worm Ultracom 2 12sxiCondensingGas89.5%
Glow-worm Ultracom 2 18sxiCondensingGas89.1%
Glow-worm Ultracom 2 24cxiCondensingGas89.0%
Glow-worm Ultracom 2 30cxiCondensingGas89.3%
Glow-worm Ultracom 2 30sxiCondensingGas89.4%
Glow-worm Ultracom 2 35 StoreCondensingGas89.4%
Glow-worm Ultracom 2 35cxiCondensingGas89.3%
Glow-worm Ultracom 24cxCondensingGas88.5%
Glow-worm Ultracom 24cxiCondensingGas88.5%
Glow-worm Ultracom 24hxiCondensingGas88.9%
Glow-worm Ultracom 30cxCondensingGas88.7%
Glow-worm Ultracom 30cxiCondensingGas88.5%
Glow-worm Ultracom 30hxiCondensingGas88.7%
Glow-worm Ultracom 30sxiCondensingGas88.8%
Glow-worm Ultracom 38cxiCondensingGas88.5%
Glow-worm Ultracom 38hxiCondensingGas89.2%
Glow-worm Ultrapower 100 SXICondensingGas89.2%
Glow-worm Ultrapower 170 SXICondensingGas89.3%
Glow-worm Xtrafast 120Non-CondensingGas78.6%
Glow-worm Xtrafast 96Non-CondensingGas79.4%
Glow-worm Xtramax ANon-CondensingGas78.9%
Glow-worm Xtramax HECondensingLPG90.2%